Match the mountains with the plates involved. Andes
north america cordillera
appalachians
aleutians

two continents plates

one continental plate, one oceanic plate.

two oceanic plate

one island plateau, one continental plate

Bwould be my guess |-/ 

Answerwide-open;

In a right-angled triangle: 1- the hypotenuse is the longest side2- we can apply pythagorean rule which states that: (hypotenuse)^2 = (side1)^2 + (side2)^2for the given triangle,longest side is 15 cm  side1 = 9 cmside2 is 12 cm  to check whether the triangle is right-angled or not,compare (15)^2 to the summation of (9)^2 and (12)^in other words, compare 225 to the summation of 81 and 144if they are both equal, then the triangle is right-angles, otherwise, it is not.you haven't provided the diagram showing her work, so i cannot tell the choice. however, apply my explanation to the question you have.

Answer (b) they're often rural migrants with no title to housing or rights to established businesses